Battery-separator.



l. M. SKINNER.

BATTERY SEPARATOR.

APPLICATION FILED 050.231.1914.

1 ,1 90,025. i Patented July 4, 1916.

11 run .srn rnsrernnroFFroE-f-1 JAMES M. sxmnnn, or PHILADELPHIA, PE'nNsvLvANIA, 'essrerron'ro PHILADEL- rum STORAGE BATTERY COMPANY, or PHILADELPHIA, TENNSYLVAJNIAA com PORATION OF FENNSYLVANIA.

BATTERY-SEPARATOR.

Philadelphia, Pennsylvania, have invented certain Improvements in Battery-Separators,f which the following is a specification. a One'object of this invention is to provide a wooden battery separator of such a nature that its resistance shallbe relatively low, the invention contemplating the cutting of the separator plates from logs or pieces of the same in.such manner that the portions of the wood which offer a. highresistance to the passage of a current will lie in lines substan- ,,tially parallel with the direction of the current flow, being alternated throughoutthe plate-structure with portions of relatively low fesistance.

This object and other advantageous ends I secure as hereinafter setforth, reference being had to the. accompanying drawings, in which,

Figure 1 is a perspective view ofai'bat tery separator constructed according to' my invention, and Fig. 2 is a fragmentary transverse section onan enlarged scale illustrating the interior structure of the plate shown in Fig. 1. I

Wood as commonly used for the manufacture of battery'flseparators, and particularly that of a dense texture, consists of alternate layers of dense or compact and relatively porous or 0 en material due to the annular growth of t e tree. If in the manufacture of separators the wood be so cutthat one or more of the dense layers lie parallel with the plane of the facesor at an acute angle thereto, it will be understood that these dense layers will largely determine the electrical, resistance of the tively high accor ing to the density and} composition of the dense layers and also de-'' late which will be relapending upon the number of layers of such material in the plate.

Specification of Letters Patent. I

My invention consists in forming a battery separator by quarter sawing, or otherwise so cutting the logs or pieces of timber that the annual growth rings lie in said separator substantially at right angles to the plane thereof. The structure 1, so made has the relatively dense but thin annual growth laminations 2 which are perpendicular to the plane of the plate, alternated with relatively thick laminations 3 of comparatively porous material, so that an electric current in passing through the plate or rather through the electrolyte with which it issaturated, is free to follow'the shortest mum resistance. .While my invention contemplates the use of any desired Wood which maybe available for the purpose, I-have. found it particularly applicable to such possible path which is likewise that of miniwoodsas yellow pine, fir, cedar and other coniferous woods of dense texture.

Iclaim:

1. A battery separator consisting of a wooden plate in which the natural laminations lie 1n planes substantially at right angles to its plane.

2. A battery separator consisting of alter- Patented July 4, 1916. Application filed December 31, 1914. Serial No. 879,841. I

nated layers of relatively high and low re-.

stantially at right angles to the plane of the separator.

3. A battery separator consisting of alternated layers of relatively high and low resistance materials extending in planes substantially at right angles to the plane of the sistance materials extending in planes subseparator, the lowresistance layers being thicker than those of the high resistance material.

In testimony whereof, I have signed my name to this specification,.in the presence of .{jawo subscribing witnesses.

JAMES M. SKINNER.

.Witnesses: WILLIAM E. BRADLEY,

WM. A. BARB. 

